The festival also includes the world premieres of Martin Scorsese's documentary about The New York Review of Books and Kim Longinotto's film Love Is All, due to be screened at Chatsworth House in Derbyshire.

Ms Croall said: "We want the industry element to be regarded as the best in the world but what we are doing now is to ramp up what we can offer the public.

"We want people that would not normally go to a documentary festival to think: 'That's for me, I want to go to that.'"